<template>
   <el-menu default-active="1-4-1" class="el-menu-vertical-demo" @open="handleOpen" @close="handleClose"
      :collapse="isCollapse" background-color="#545c64" text-color="#fff" active-text-color="#ffd04b">
      <h3>{{ isCollapse ? '后台' : '通用后台管理系统' }}</h3>
      <el-menu-item @click="clickMenu(item)" v-for="item in noChildren" :key="item.name" :index="item.name">
         <i :class="`el-icon-${item.icon}`"></i>
         <span slot="title">{{ item.label }}</span>
      </el-menu-item>
      <el-submenu v-for="item in hasChildren" :key="item.label" :index="item.label">
         <template slot="title">
            <i :class="`el-icon-${item.icon}`"></i>
            <span slot="title">{{ item.label }}</span>
         </template>
         <el-menu-item-group>
            <el-menu-item @click="clickMenu(subItem)" v-for="subItem in item.children" :key="subItem.name"
               :index="subItem.name">
               {{ subItem.label }}
            </el-menu-item>
         </el-menu-item-group>
      </el-submenu>
   </el-menu>
</template>
<script>
import Cookie from 'js-cookie'
export default {
   data() {
      return {}
   },
   methods: {
      handleOpen(key, keyPath) {
         console.log(key, keyPath);
      },
      handleClose(key, keyPath) {
         console.log(key, keyPath);
      },
      // 点击菜单
      clickMenu(item) {
         // 当页面路由和当前路由不一致才允许跳转
         if (this.$route.path !== item.path && !(this.$route.path === '/home' && (item.path === '/'))) {
            this.$router.push(item.path)
         }
         this.$store.commit('selectMenu', item)
      }
   },
   computed: {
      // 没有子菜单
      noChildren() {
         return this.menuData.filter(item => !item.children)
      },
      // 有子菜单
      hasChildren() {
         return this.menuData.filter(item => item.children)
      },
      isCollapse() {
         return this.$store.state.tab.isCollapse
      },
      menuData() {
         // 判断当前数据，如果缓存中没有，则从store中获取
         return JSON.parse(Cookie.get('menu')) || this.$store.state.tab.menu
      }
   }
}
</script>
<style lang="less" scoped>
.el-menu-vertical-demo:not(.el-menu--collapse) {
   width: 200px;
   min-height: 400px;
}

.el-menu {
   height: 100vh;
   border-right: none;

   h3 {
      color: #fff;
      text-align: center;
      line-height: 48px;
      font-size: 16px;
      font-weight: 400;
   }
}
</style>
